21601704127 has 2 divisors, whose sum is σ = 21601704128. Its totient is φ = 21601704126.

The previous prime is 21601703951. The next prime is 21601704139. The reversal of 21601704127 is 72140710612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21601704127 - 2²⁷ = 21467486399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21601704197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10800852063 + 10800852064.

It is an arithmetic number, because the mean of its divisors is an integer number (10800852064).

Almost surely, 2^21601704127 is an apocalyptic number.

21601704127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21601704127 is an equidigital number, since it uses as much as digits as its factorization.

21601704127 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4704, while the sum is 31.

The spelling of 21601704127 in words is "twenty-one billion, six hundred one million, seven hundred four thousand, one hundred twenty-seven".